ZEN Amps
Well-known member
How long do you think the decay time of a guitar cab is? How long would an IR need to be to capture authentic dynamics of a cab, in your opinion?
Cab IR's are used to create an EQ curve, have nothing to do with decay time, and do not capture 'authentic dynamics' - so that question is unanswerable.
However a 20ms IR created from a 1 sample tick can near perfectly recreate the response of a close-miked cab if done properly - something that many manufacturers figured out a long time ago. Pete Thorn did a good video on 20ms vs 200ms IR's - but doing it for yourself is always far better.
I was certainly a non-believer until I performed extensive testing on this (we're currently creating our own load and IR's for a special project). I'm not claiming to be an expert, but I have put in a few hundred hours and have made a suite of IR's from a pretty large and varied collection of cabs that are indistinguishable from the source. The whole concept seems so counter-intuitive until you get the results yourself, then it's a real lightbulb moment.
I've confined my learning exclusively to cab responses, and claim no expertise on reverberant acoustic spaces and convolution reverbs - maybe if we have another 7 month lockdown here in Australia I'll deep dive into that.
I'm not trying to argue with you, just report what I've learnt over the last couple of years on the subject, cheers.